matchbrackets.min.js (6058B)
1 // CodeMirror, copyright (c) by Marijn Haverbeke and others 2 // Distributed under an MIT license: http://codemirror.net/LICENSE 3 4 (function(mod) { 5 if (typeof exports == "object" && typeof module == "object") // CommonJS 6 mod(require("../../lib/codemirror")); 7 else if (typeof define == "function" && define.amd) // AMD 8 define(["../../lib/codemirror"], mod); 9 else // Plain browser env 10 mod(CodeMirror); 11 })(function(CodeMirror) { 12 var ie_lt8 = /MSIE \d/.test(navigator.userAgent) && 13 (document.documentMode == null || document.documentMode < 8); 14 15 var Pos = CodeMirror.Pos; 16 17 var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"}; 18 19 function findMatchingBracket(cm, where, config) { 20 var line = cm.getLineHandle(where.line), pos = where.ch - 1; 21 var afterCursor = config && config.afterCursor 22 if (afterCursor == null) 23 afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className) 24 25 // A cursor is defined as between two characters, but in in vim command mode 26 // (i.e. not insert mode), the cursor is visually represented as a 27 // highlighted box on top of the 2nd character. Otherwise, we allow matches 28 // from before or after the cursor. 29 var match = (!afterCursor && pos >= 0 && matching[line.text.charAt(pos)]) || 30 matching[line.text.charAt(++pos)]; 31 if (!match) return null; 32 var dir = match.charAt(1) == ">" ? 1 : -1; 33 if (config && config.strict && (dir > 0) != (pos == where.ch)) return null; 34 var style = cm.getTokenTypeAt(Pos(where.line, pos + 1)); 35 36 var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config); 37 if (found == null) return null; 38 return {from: Pos(where.line, pos), to: found && found.pos, 39 match: found && found.ch == match.charAt(0), forward: dir > 0}; 40 } 41 42 // bracketRegex is used to specify which type of bracket to scan 43 // should be a regexp, e.g. /[[\]]/ 44 // 45 // Note: If "where" is on an open bracket, then this bracket is ignored. 46 // 47 // Returns false when no bracket was found, null when it reached 48 // maxScanLines and gave up 49 function scanForBracket(cm, where, dir, style, config) { 50 var maxScanLen = (config && config.maxScanLineLength) || 10000; 51 var maxScanLines = (config && config.maxScanLines) || 1000; 52 53 var stack = []; 54 var re = config && config.bracketRegex ? config.bracketRegex : /[(){}[\]]/; 55 var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1) 56 : Math.max(cm.firstLine() - 1, where.line - maxScanLines); 57 for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) { 58 var line = cm.getLine(lineNo); 59 if (!line) continue; 60 var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1; 61 if (line.length > maxScanLen) continue; 62 if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0); 63 for (; pos != end; pos += dir) { 64 var ch = line.charAt(pos); 65 if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) { 66 var match = matching[ch]; 67 if ((match.charAt(1) == ">") == (dir > 0)) stack.push(ch); 68 else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch}; 69 else stack.pop(); 70 } 71 } 72 } 73 return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null; 74 } 75 76 function matchBrackets(cm, autoclear, config) { 77 // Disable brace matching in long lines, since it'll cause hugely slow updates 78 var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000; 79 var marks = [], ranges = cm.listSelections(); 80 for (var i = 0; i < ranges.length; i++) { 81 var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config); 82 if (match && cm.getLine(match.from.line).length <= maxHighlightLen) { 83 var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket"; 84 marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style})); 85 if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen) 86 marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style})); 87 } 88 } 89 90 if (marks.length) { 91 // Kludge to work around the IE bug from issue #1193, where text 92 // input stops going to the textare whever this fires. 93 if (ie_lt8 && cm.state.focused) cm.focus(); 94 95 var clear = function() { 96 cm.operation(function() { 97 for (var i = 0; i < marks.length; i++) marks[i].clear(); 98 }); 99 }; 100 if (autoclear) setTimeout(clear, 800); 101 else return clear; 102 } 103 } 104 105 var currentlyHighlighted = null; 106 function doMatchBrackets(cm) { 107 cm.operation(function() { 108 if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;} 109 currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets); 110 }); 111 } 112 113 CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) { 114 if (old && old != CodeMirror.Init) { 115 cm.off("cursorActivity", doMatchBrackets); 116 if (currentlyHighlighted) {currentlyHighlighted(); currentlyHighlighted = null;} 117 } 118 if (val) { 119 cm.state.matchBrackets = typeof val == "object" ? val : {}; 120 cm.on("cursorActivity", doMatchBrackets); 121 } 122 }); 123 124 CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);}); 125 CodeMirror.defineExtension("findMatchingBracket", function(pos, config, oldConfig){ 126 // Backwards-compatibility kludge 127 if (oldConfig || typeof config == "boolean") { 128 if (!oldConfig) { 129 config = config ? {strict: true} : null 130 } else { 131 oldConfig.strict = config 132 config = oldConfig 133 } 134 } 135 return findMatchingBracket(this, pos, config) 136 }); 137 CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){ 138 return scanForBracket(this, pos, dir, style, config); 139 }); 140 });